
B–63173EN–1/01
15. PMC CONTROL FUNCTION
549
The following signals are used to send data from the PMC to the CNC.
Signal name Signal code
Data signal for external data input (input)
Address signal for external data input (input)
Read signal for external data input (input)
Read completion signal for external data input
(output)
Search completion signal for external data input
(output)
ED0 to ED15
EA0 to EA6
ESTB
EREND
ESEND
The basic external data input procedure is described below:
(1)The PMC sets address signals EA0 to EA6 that indicate the data type
and data signals ED0 to ED15.
(2)The PMC sets read signal ESTB to “1”.
(3)When the ESTB signal is set to “1”, the control unit reads the address.
(4)After reading the address, the control unit sets read completion signal
EREND to “1”.
(5)When the EREND signal is set to “1”, the PMC sets the ESTB signal
to 0.
(6)When the ESTB signal is set to “0”, the control unit sets the EREND
signal to 0.
This completes the data input procedure. New data can now be entered.
The timing diagram is shown below:
32 ms or more
0 ms or
more
ESTB
EREND
ED0 to 15
EA0 to 6
Only for external program number search
ESEND
End of
search
15.2
EXTERNAL DATA
INPUT
General